tzif: moved document to tzif.md

doc/formats.md

@@ -748,6 +748,16 @@ fq '.tcp_connections[] | select(.server.port=="rtmp") | d' file.cap
 
 ## tzif
 
+### Get last transition time
+```sh
+fq '.v2plusdatablock.transition_times[-1] | tovalue' tziffile
+```
+
+### Count leap second records
+```sh
+fq '.v2plusdatablock.leap_second_records | length' tziffile
+```
+
 ### Authors
 - Takashi Oguma
 [@bitbears-dev](https://github.com/bitbears-dev)
@@ -756,7 +766,6 @@ fq '.tcp_connections[] | select(.server.port=="rtmp") | d' file.cap
 ### References
 - https://datatracker.ietf.org/doc/html/rfc8536
 
-
 ## wasm
 
 ### Count opcode usage

format/tzif/tzif.go

@@ -1,6 +1,7 @@
 package tzif
 
 import (
+	"embed"
 	"fmt"
 	"time"
 
@@ -10,6 +11,9 @@ import (
 	"github.com/wader/fq/pkg/scalar"
 )
 
+//go:embed tzif.md
+var tzifFS embed.FS
+
 func init() {
 	interp.RegisterFormat(decode.Format{
 		Name:        format.TZIF,
@@ -17,6 +21,7 @@ func init() {
 		DecodeFn:    decodeTZIF,
 		Groups:      []string{format.PROBE},
 	})
+	interp.RegisterFS(tzifFS)
 }
 
 func decodeTZIF(d *decode.D, _ any) any {

format/tzif/tzif.md

@@ -0,0 +1,17 @@
+### Get last transition time
+```sh
+fq '.v2plusdatablock.transition_times[-1] | tovalue' tziffile
+```
+
+### Count leap second records
+```sh
+fq '.v2plusdatablock.leap_second_records | length' tziffile
+```
+
+### Authors
+- Takashi Oguma
+[@bitbears-dev](https://github.com/bitbears-dev)
+[@0xb17bea125](https://twitter.com/0xb17bea125)
+
+### References
+- https://datatracker.ietf.org/doc/html/rfc8536